• [y] closes #821
• [y] tests added / passed *
• [y] passes git diff upstream/master -u -- "*.py" | flake8 --diff
• [y] passes black --check pandas_datareader
• [y] added entry to docs/source/whatsnew/v.0.9.1.txt

• Tests added as 'formats' fixture parametrisations ('json', 'csv') in test_tiingo.py

Codecov Report

Merging #822 into master will decrease coverage by 1.39%. The diff coverage is 19.44%.

@@            Coverage Diff             @@
##           master     #822      +/-   ##
==========================================
- Coverage   64.67%   63.27%   -1.40%     
==========================================
  Files          62       62              
  Lines        2848     2775      -73     
  Branches      305      306       +1     
==========================================
- Hits         1842     1756      -86     
- Misses        932      945      +13     
  Partials       74       74              

Impacted Files	Coverage Δ
pandas_datareader/tiingo.py	25.66% <7.40%> (-8.00%)	:arrow_down:
pandas_datareader/tests/test_tiingo.py	38.00% <42.85%> (-4.31%)	:arrow_down:
pandas_datareader/base.py	84.09% <100.00%> (-0.47%)	:arrow_down:
pandas_datareader/av/time_series.py	30.23% <0.00%> (-9.77%)	:arrow_down:
pandas_datareader/tests/av/test_av_forex.py	50.00% <0.00%> (-8.07%)	:arrow_down:
pandas_datareader/av/quotes.py	28.57% <0.00%> (-5.64%)	:arrow_down:
pandas_datareader/av/forex.py	22.72% <0.00%> (-4.94%)	:arrow_down:
pandas_datareader/tests/test_moex.py	73.91% <0.00%> (-4.35%)	:arrow_down:
pandas_datareader/tests/av/test_av_quotes.py	50.00% <0.00%> (-4.17%)	:arrow_down:
pandas_datareader/tests/av/test_av_sector.py	62.50% <0.00%> (-4.17%)	:arrow_down:
... and 36 more

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Regarding testing. The API has free plan - it would be possible to setup dedicated key for automated tests ( https://api.tiingo.com/about/pricing )

Hi, Just a quick ping to check whether I am missing anything for this PR to get it merged for a release?